Marking slaves

The Register allows slaves to obtain a lifelong Registration Number,
which can remain unchanged even if the slave's name is changed by
future
owners. Since the Registration Number is associated with the slave
rather than the relationship, it may be used to avoid the taboo against
relationship specific body modifications (ie a tattoo of the
Registration Number marks the bearer as a slave or submissive, not as a
particular owner's slave.)

As an example, a slave owner may enjoy marking their property's body,
collar etc with the slave's Registration Number, safe in the knowledge
that this identifies them as a slave and allows third parties to
determine the slave's owner using this number and the Register entry.
This provides a measure of third party acknowledgement of their bond
and
can make the slave's condition feel more inescapable and therefore more
complete.